3928478669 has 2 divisors, whose sum is σ = 3928478670. Its totient is φ = 3928478668.

The previous prime is 3928478651. The next prime is 3928478783. The reversal of 3928478669 is 9668748293.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1993622500 + 1934856169 = 44650^2 + 43987^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3928478669 is a prime.

It is a super-2 number, since 2×3928478669² = 30865889305576023122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3928478569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1964239334 + 1964239335.

It is an arithmetic number, because the mean of its divisors is an integer number (1964239335).

Almost surely, 2^3928478669 is an apocalyptic number.

It is an amenable number.

3928478669 is a deficient number, since it is larger than the sum of its proper divisors (1).

3928478669 is an equidigital number, since it uses as much as digits as its factorization.

3928478669 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31352832, while the sum is 62.

The square root of 3928478669 is about 62677.5770830366. The cubic root of 3928478669 is about 1577.8830095971.

The spelling of 3928478669 in words is "three billion, nine hundred twenty-eight million, four hundred seventy-eight thousand, six hundred sixty-nine".